Ingredients of Cement
| INGREDIENT | PERCENTAGE | USE | EXCESS | LACK |
|---|---|---|---|---|
| LIME | 60-65 | STRENGTH | Unsound, disintegration of cement. | Low strength, decrease setting time |
| SILICA | 17-25 | STRENGTH | High strength, increase setting time | Low strength, decrease setting time |
| ALUMINA | 3-8 | SETTING TIME | Decrease setting time, decrease temperature of clinker | Increase setting time |
| IRON OXIDE | 0.5-6 | COLOUR | Reddish color | Low hardness |
| MAGNESIA | 0.1-3 | COLOUR | Yellowish color | Low hardness |
| GYPSUM | 1-3 | SETTING TIME | Increases setting time | Decreases setting time |
| SULPHUR | 1-3 | SOUNDNESS | Unsound | Unsound |
| ALKALI | 0.1-1 | Efflorescence |